body,html
  line-height : 1
  font-weight : 200
  font-family : 'PingFang SC', 'STHeitiSC-Light','Helvetica-Light',arial,sans-serif

.clearfix
  display: inline-block
  &.after
    display:block
    content:"."
    height: 0
    line-height:0
    clear:both
    visibility: hidden

@media (-webkit-min-device-pixel-ratio: 1.5),(min-device-pixel-ratio: 1.5)
  .border-1px
    &::after
      -webkit-transform :scaleY(0.7)
      transform :scaleY(0.7)
      // 1.5*0.7 => 1px

@media (-webkit-min-device-pixel-ratio: 2),(min-device-pixel-ratio: 2)
  .border-1px
    &::after
      -webkit-transform :scaleY(0.5)
      transform :scaleY(0.5)
      // 2*0.5 => 1px
